I noticed yesterday that one of my red dwarf gourami's has developed a white area along the top of its head just before the fin. He seems very active and is eating well, no colour fade. He does go through a rock we have in the tank which is quite a tight squeeze, I wondered was it maybe an abrasion? I have taken photos but not sure how to get them onto post.
We have a 140L tank (L=122cm, D=32cm, H=47cm), we cycled the tank for 8 weeks (fishless) and have had fish in tank for about 7 weeks. We have 2 red/1blue dwarf gourami's, 6 roberti tetra, 6 black phantoms, 3 juvenile blue rainbows and 1 siamese algae eater. We use a fluval 4 plus filter, gravel depth 3cm, soil and gravel, tap water, dechlorinator, daily fertiliser, carbon fertiliser. We have real plants, a couple of rocks with holes, a large piece of bog-wood with some hiding places. Water is changed every weekend 20%, we feed 6 days a week flake and bloodworm on alternate days - only enough they finish in 1 min.
Water parameters: pH = 7.4, Ammonia, Nitrites & nitrates = 0. Temp = 25 - 27oC.